Use NEON optimizations for RGB -> RGB(FF) or BGR(FF) in SkSwizzler

bench/SwizzleBench.cpp

Index: bench/SwizzleBench.cpp
diff --git a/bench/SwizzleBench.cpp b/bench/SwizzleBench.cpp
index 922c276dbc78449b884337377c498700039cc958..c78f2c977d8fd9e0738b1fca3e8bf5a7ad7f4d9f 100644
--- a/bench/SwizzleBench.cpp
+++ b/bench/SwizzleBench.cpp
@@ -30,3 +30,5 @@ private:
 DEF_BENCH(return new SwizzleBench("SkOpts::RGBA_to_rgbA", SkOpts::RGBA_to_rgbA));
 DEF_BENCH(return new SwizzleBench("SkOpts::RGBA_to_bgrA", SkOpts::RGBA_to_bgrA));
 DEF_BENCH(return new SwizzleBench("SkOpts::RGBA_to_BGRA", SkOpts::RGBA_to_BGRA));
+DEF_BENCH(return new SwizzleBench("SkOpts::RGB_to_RGB1",  SkOpts::RGB_to_RGB1));
+DEF_BENCH(return new SwizzleBench("SkOpts::RGB_to_BGR1",  SkOpts::RGB_to_BGR1));